I read this book a few years ago. I thought the title was "Adventures of SilverFox" but nothing is coming up in search engines. It might have been wolf in stead of fox. It's a science fiction young adult book.

The book is about a young man that grew up in a prison camp. America had been taken over and many were imprisoned. The boy escapes and joins the resistance to one day return and free the rest of the prisoners. Along the way he takes over a train, flys a plane, and joins a children's resistance as well as interpreting enemy communications for the adult resistance.

Can you help me?

I just found it! It's "The White Fox Chronicles" by Gary Paulsen. :)